1985 Ford Bronco pulleys

Tiny
JEHUSAFAT
  • MEMBER
  • 1985 FORD BRONCO
Engine Mechanical problem
1985 Ford Bronco V8 Four Wheel Drive Automatic

i have a full size for bronco with a 302 it has the v-belt pulleys I am having trouble with the alternator to the crankshaft pulley belt. The pulley after tightened down begins to roll over and comes off once it comes off knocks off all other belts no matter what I do I cant fix the problem and have noticed that the pulleys are not aligned but cant fix. And my crank pulley actually moves forward when engine revs then aligns but belt still pops off
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Wednesday, April 1st, 2009 AT 7:26 PM

9 Replies

Tiny
BLACKOP555
  • EXPERT
The pulley moves towards the back of engine and front. Or up towards hood then down towards floor?

You sure that both pulleys arnt popping off at the same time? How long belt stay on?
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Saturday, April 4th, 2009 AT 3:01 PM
Tiny
JEHUSAFAT
  • MEMBER
Hey the crank pulley moves toward radiator when engine revs up and it is only that pulley that moves and the belt rolls in the direction the pulley moves and pops off I am not sure if there is a special pulley or if the harmonic balancer or the pulley is bad.
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Sunday, April 5th, 2009 AT 3:38 PM
Tiny
BLACKOP555
  • EXPERT
The crank may be worn. Could have excessive axial thrust. Causing it to pull forward. I would check to make sure the pulley is tight to the crankshaft. Theres a large bolt in the center. Then check the harmonic balancer and make sure its tight.
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Monday, April 6th, 2009 AT 5:56 PM
Tiny
JEHUSAFAT
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Would that also explain why the belt is angled and keeps popping off?
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Monday, April 6th, 2009 AT 7:25 PM
Tiny
BLACKOP555
  • EXPERT
If the balancer is loose or the main pulley is loose it can cause vibration and wrong angles causing the belt to pop off.

Same if crankshaft is bad and is causing pulling and vibration.
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Monday, April 6th, 2009 AT 8:57 PM
Tiny
JEHUSAFAT
  • MEMBER
Hey I have one last question if I cant fix it can I replace the vbelt system with a serpentine system off a 1987 ford bronco or is there special kits for this if so please let me know thanks for the info you have given so far
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Wednesday, April 8th, 2009 AT 4:27 PM
Tiny
BLACKOP555
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I wouldnt suggest it. If the crankshaft is broken yopu need a new anyways.
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Wednesday, April 8th, 2009 AT 9:03 PM
Tiny
JEHUSAFAT
  • MEMBER
I had a chance to take a look at the crankshaft and it is fine the problem still is in just the pulleys so I was wanting to get rid of the vbelt and put on a serpentine system from an 87 or newer bronco if it will fit
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Wednesday, April 8th, 2009 AT 10:16 PM
Tiny
BLACKOP555
  • EXPERT
Not worth the money for the parts needed. I would suggest just buying the pulleys needed and fix it.
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Friday, April 10th, 2009 AT 8:52 AM

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